The following numerically ordered sequence of numbers has a mean of 17 and a median of 18.
7, a, 12, 15, 17, b, 20, 22, 24,25
given this information, the values of a and b must be:

Aswim teacher sells lesson packages. the best deal has the highest ratio of lessons to total cost. swim lesson packagesnumber of lessons total cost$10$4010 1 $8015$80which package is the best deal? l lesson for $105 lessons for $4010 lessons for $8015 lessons for $80mark this and returnsave and exit

Anormally distributed data set has a mean of 176.3 and a standard deviation of 4.2. what is the approximate z-score for the data value of 167.9? 2.00 −2.00 8.4 −8.4

Ineed to know the answer to this algebra question.